RE: [DML] Re: Engine running half rich half lean.

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Harold,
>From what I understand from talking to Jeremiah is that 3 plugs on one side
are burning rich and 3 plugs on the other side are burning lean. This has
really got me thinking as to what could cause that.
John



-----Original Message-----
From: Harold McElraft [mailto:hmcelraft@xxxxxxx]
Sent: Monday, March 08, 2004 4:36 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: Engine running half rich half lean.


> Sounds like something is sticking or not working until a higher temp
> causes it to work. So, I would be suspect of any engine management
> sensor that is temperature activated and any related vacuum lines.
> Your case is interesting because many idle problems are after warm-
> up, not at a cold start.
>
> I would be careful to check that the air sensor plate is moving
> freely when cold. If the piston the sensor operates is sticking it
> will cause weird and sudden engine surges. Sometimes Marvel Mystery
> Oil in the fuel can help cure this. The idle motor may also be
> sticking, moving too slow or limited in range when cold.
>
> Check and clean all electrical connections too, especially the
> connections on the frequency valve and on the fuel pressure
> regulator.
>
> Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, Enid/Jeremiah
<hispanicangeleyes@xxxx> wrote:
>> This is a unique problem.  When I start my car now, the engine
>> will run half lean and half rich.  The driver's side (4,5,6) all run
>> rich (spark plugs are charcoal colored), and the passenger side
>> (1,2,3) are lean.  The mixture screw has



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